WO2017135455A1 - ユーザ装置、及びランダムアクセス方法 - Google Patents

ユーザ装置、及びランダムアクセス方法 Download PDF

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Publication number
WO2017135455A1
WO2017135455A1 PCT/JP2017/004119 JP2017004119W WO2017135455A1 WO 2017135455 A1 WO2017135455 A1 WO 2017135455A1 JP 2017004119 W JP2017004119 W JP 2017004119W WO 2017135455 A1 WO2017135455 A1 WO 2017135455A1
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WIPO (PCT)
Prior art keywords
transmission
base station
random access
rach
user apparatus
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PCT/JP2017/004119
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English (en)
French (fr)
Japanese (ja)
Inventor
真平 安川
一樹 武田
和晃 武田
浩樹 原田
聡 永田
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株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to CN201780009353.XA priority Critical patent/CN108702635A/zh
Priority to AU2017215885A priority patent/AU2017215885B2/en
Priority to EP17747606.6A priority patent/EP3413607B1/en
Priority to ES17747606T priority patent/ES2949298T3/es
Priority to US16/074,160 priority patent/US11632800B2/en
Priority to JP2017565672A priority patent/JP7102148B2/ja
Priority to CN202310416489.XA priority patent/CN116405952A/zh
Publication of WO2017135455A1 publication Critical patent/WO2017135455A1/ja
Priority to JP2022062543A priority patent/JP7232948B2/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]

Definitions

  • the present invention relates to a random access procedure executed between a user apparatus and a base station in a mobile communication system.
  • the next-generation mobile communication system 5G is aiming for wider bandwidth by using a frequency higher than the existing frequency.
  • radio wave propagation loss increases at high frequencies, in order to compensate for this, it has been studied to perform beam forming by applying Massive MIMO (large-scale MIMO using a large number of antennas).
  • Beam forming is a technique for imparting directivity to a transmission (reception) beam by controlling the amplitude and phase of each signal in a plurality of transmission (reception) antennas. High gain can be obtained by narrowing the beam width.
  • the beam forming performed by the base station eNB (hereinafter referred to as eNB) on the user apparatus UE (hereinafter referred to as UE) is executed / controlled based on the channel state between the eNB and the UE. If the UE is connected to the eNB, the eNB can perform beamforming based on channel state information notified from the UE.
  • Non-Patent Document 1 Random access (Non-Patent Document 1) performed before the UE is connected to the eNB, the eNB cannot acquire channel state information, so that it is difficult to apply beamforming.
  • the eNB when the eNB receives a RACH preamble with an omni pattern without applying reception beamforming, repeated transmission by the UE is required for coverage extension, and overhead and delay increase. Also, if the eNB receives the received beamforming and receives it, if the UE that transmits the RACHapreamble does not perform beam selection, the coverage may be further reduced due to reception by inappropriate beamforming.
  • the present invention has been made in view of the above points, and provides a technique that enables a base station to appropriately apply a beam in random access performed between a user apparatus and a base station. Objective.
  • the user device in the wireless communication system comprising a base station and a user device, the user device that communicates with the base station, A storage unit that stores correspondence information in which an identifier of a beam formed by the base station is associated with configuration information used for transmission of a random access signal; A selection unit that selects a specific beam based on reception quality of signals transmitted from the base station using a plurality of different beams, and that selects configuration information corresponding to the specific beam based on the correspondence information; There is provided a user apparatus comprising: a transmission unit that transmits a random access signal to the base station using the configuration information selected by the selection unit.
  • the wireless communication system comprising a base station and a user device
  • the user device that communicates with the base station
  • a storage unit for storing transmission patterns having a plurality of pieces of configuration information associated with beams formed by the base station, which are configuration information used for transmission of random access signals;
  • a user apparatus comprising: a transmission unit that transmits a random access signal a plurality of times without waiting for a random access response using each configuration information in the transmission pattern.
  • a random access method executed by the user device that communicates with the base station includes a storage unit that stores correspondence information in which an identifier of a beam formed by the base station is associated with configuration information used for transmission of a random access signal, A selection step of selecting a specific beam based on reception quality of signals transmitted from the base station using a plurality of different beams, and selecting configuration information corresponding to the specific beam based on the correspondence information; A random access method comprising: a transmission step of transmitting a random access signal to the base station using the configuration information selected in the selection step.
  • a random access method executed by the user device that communicates with the base station includes a storage unit that stores configuration information used for transmission of a random access signal, the transmission pattern having a plurality of configuration information associated with beams formed by the base station,
  • a random access method comprising a transmission step of transmitting a random access signal a plurality of times without waiting for a random access response using each piece of configuration information in the transmission pattern.
  • a technique is provided that enables a base station to appropriately apply a beam in random access performed between a user apparatus and a base station.
  • LTE Long Term Evolution
  • 3GPP Rel-12 3GPP Rel-12, 13, 14 or later.
  • FIG. 2 shows an overall configuration diagram of a wireless communication (mobile communication) system according to an embodiment of the present invention (common to the first embodiment, the second embodiment, and a modification).
  • the radio communication system according to the present embodiment includes a base station eNB forming a cell and a user apparatus UE (hereinafter referred to as UE) that communicates with the base station eNB (hereinafter referred to as eNB).
  • UE user apparatus UE
  • eNB user apparatus UE
  • Each eNB and UE has at least LTE functions.
  • the eNB in the present embodiment has a massive MIMO function, and can form various beams from a wide beam to a narrow beam.
  • the eNB can form not only a beam in transmission / reception of data but also a beam in transmission / reception of a synchronization signal, a reference signal, a broadcast signal, and the like.
  • the UE may be a UE that can perform beamforming transmission or a UE that does not perform beamforming transmission. In the following, it is basically assumed that the UE does not perform beamforming transmission.
  • Random access procedure In this embodiment, since the UE mainly targets random access performed by the UE to the eNB, first, basic processing of the random access procedure will be described.
  • Random access (hereinafter referred to as RA) is performed when the UE establishes a connection with the eNB at the time of transmission or by handover or the like, and its main purpose is to establish uplink synchronization.
  • the RA procedure includes a collision type RA procedure and a non-collision type RA procedure.
  • the collision-type RA procedure can be used for all purposes, and the non-collision-type RA procedure is used for a specific purpose such as handover.
  • the UE transmits a RACH preamble (selected preamble sequence) by PRACH (Physical Random Access Channel) using one preamble sequence from among a predetermined number of preamble sequences (step S11). If there is no other UE that performs random access using the same sequence at the same time, no collision occurs.
  • RACH preamble selected preamble sequence
  • PRACH Physical Random Access Channel
  • the eNB that has received the RACH preamble can estimate the UE transmission timing.
  • the eNB uses DL-SCH (downlink shared channel), TA (timing advance) command for adjusting the transmission timing of the UE, detected RACH preamble index, uplink resource allocation information (UL grant ) Including RACHRACresponse (response) is transmitted to the UE.
  • DL-SCH downlink shared channel
  • TA timing advance
  • UL grant uplink resource allocation information
  • RACHRACresponse Including RACHRACresponse (response) is transmitted to the UE.
  • the UE that has received the RACH response adjusts the uplink timing, and transmits a control message such as RRC connection request to the eNB by using the allocated resource by UL-SCH (uplink shared channel) (step S13).
  • the UE When the UE that transmitted the RACH preamble fails to receive the RACH response (when the random access attempt fails), the UE increases the transmission power by a predetermined step size and performs PRACH each time it fails. Send. Such an operation is called Power Ramping.
  • step S14 the eNB transmits contention resolution (contention resolution message) on the DL-SCH.
  • the UE that has received the contention resolution completes the random access processing by confirming that its own ID (eg, TC-RNTI, which was used for scrambling in step S13) is included. Transmission / reception is performed (step S15).
  • Fig. 4 shows the non-collision type RA procedure.
  • a preamble is assigned from the eNB to the UE in step S21.
  • the UE transmits this preamble by PRACH (step S22) and receives a RACH response from the eNB (step S23).
  • the random access process is completed in step S23, and thereafter, data transmission / reception is performed (step S24).
  • the eNB can form a plurality of downlink beams.
  • each beam is assigned an index (hereinafter, a beam having an index of 1 is referred to as a beam 1 or the like).
  • the eNB transmits a beam selection signal with each beam so that the UE can select an appropriate downlink beam.
  • the beam selection signal includes, for example, a synchronization signal (eg, PSS, SSS), a broadcast signal (eg, a signal transmitted by PBCH), system information (eg, SIB), and a reference signal (eg, CRS, CSI-RS). Or a combination of any of these.
  • the beam selection signal for each beam is transmitted using a predetermined frequency resource, time resource, or frequency / time resource.
  • the eNB transmits a beam selection signal with beam 1 in resource 1 (eg, a certain subframe), transmits a beam selection signal with beam 2 in resource 2 (eg, another subframe), and so on.
  • a beam selection signal is transmitted with each beam.
  • the image is drawn on the left side of FIGS. 5A and 5B.
  • the “resource” includes a “sequence” of beam selection signals.
  • beam 1 and beam 2 may be transmitted with the same frequency / time resource, and different series beam selection signals (series 1 is used for beam 1 and series 2 is used for beam 2).
  • the UE holds in advance correspondence information between the downlink beam index and downlink resources (this is called correspondence information A).
  • correspondence information A indicating correspondence such that downlink beam 1 corresponds to resource 1 and downlink beam 2 corresponds to resource 2.
  • the correspondence information A may be set in advance in the UE, for example, or may be notified from the eNB to the UE by broadcast information, higher layer signaling, or the like.
  • an uplink resource configuration (this is referred to as a RACH configuration) used by the UE for transmitting a RACH preamble is associated with a downlink beam index in advance.
  • the correspondence information between the RACH configuration and the downlink beam index is referred to as correspondence information B.
  • the RACH configuration consists of any one of time resources, frequency resources, preamble sequences, a combination of any two, or a combination of three.
  • the RACH configuration is a combination of time resources and frequency resources (denoted as time / frequency resources)
  • the RACH configuration corresponding to the downlink beam 1 (described as RACH configuration 1, the same applies hereinafter) is time / frequency.
  • the downlink beam and the RACH configuration (resource) are associated with each other, such as resource 1 and RACH configuration 2 is time / frequency resource 2.
  • the correspondence information B indicating the correspondence between the downlink beam index and the RACH configuration may be set in advance in the UE, for example, and is notified from the eNB to the UE by broadcast information, higher layer signaling, or the like. There may be. Alternatively, it may be notified for each subframe or group of subframes using downlink L1 / L2 control information.
  • the correspondence information B corresponds to an index and a resource (any one or combination of time, frequency, or series as described above), for example, (Index 1, Resource 1), (Index 2, Resource 2). Information.
  • an implicit notification using a subframe in which control information is transmitted can be performed for the subframes in the resources.
  • the eNB according to the present embodiment can form, on the reception side, a beam similar to the transmission beam that transmits the beam selection signal (with the same directivity and beam width as the transmission beam) as a reception beam. It is assumed that the received beam is also assigned the same index as the corresponding transmission beam.
  • selectable RACH configurations may be limited according to the UE state.
  • the multiple RACH configurations may be notified so that the UE can select the RACH configuration according to the moving speed of the UE, the estimated Doppler frequency, the position, the terminal capability, and the like.
  • RACH ⁇ ⁇ ⁇ preamble is received by the resource of the RACH configuration identified by the index in the reception beam identified by each index.
  • a RACH preamble transmitted using the RACH configuration 1 resource is received by the uplink beam 1 corresponding to the RACH configuration 1 (uplink beam corresponding to the downlink beam 1), and the RACH preamble transmitted using the RACH configuration 2 resource is , Received by the upstream beam 2 corresponding to the RACH configuration 2 (the upstream beam corresponding to the downstream beam 2).
  • the eNB transmits a beam selection signal using each beam.
  • the UE measures a beam selection signal received with a resource corresponding to each beam, and identifies, for example, a resource of a beam selection signal having the highest reception level (reception power).
  • reception quality (such as RSRQ) may be used instead of the reception level.
  • reception level the same applies to the “reception level”.
  • “reception quality” may be used in the meaning including the reception level.
  • the UE specifies the downlink beam index corresponding to the resource of the beam selection signal with the highest reception quality based on the downlink beam index and downlink resource correspondence information A described above.
  • i is specified as the downlink beam index.
  • the UE selects a RACH configuration (RACH configuration i) corresponding to the index i based on the correspondence information B, and transmits a RACH preamble using the RACH configuration i.
  • the eNB can receive the RACH preamble by applying the reception beam i.
  • the UE specifies j as the downlink beam index. Subsequently, the UE selects a RACH configuration (RACH configuration j) corresponding to the index j based on the correspondence information B, and transmits a RACH preamble using the RACH configuration j.
  • the eNB can receive the RACH preamble by applying the reception beam j.
  • the above-described configuration is preferable because channel characteristics of the uplink and downlink are common due to the reversibility of the propagation path.
  • the above configuration may be applied to FDD. This is because even in the case of FDD, the channel characteristics of the uplink and downlink have a certain degree of commonality.
  • the signal reception quality in the uplink beam having the same direction (reverse direction) and width as the direction and width of the downlink beam. Can be bad (good).
  • FIG. 6 shows a sequence example of the collision-type RA procedure in the present embodiment.
  • a beam selection signal (SS, PBCH, SIB, etc.) is transmitted from each eNB to the UE from each eNB (step S101).
  • the UE selects, for example, a beam selection signal having the highest reception level (that is, a downlink beam) from the beam selection signals received by each resource corresponding to each beam, and selects a RACH configuration corresponding to the downlink beam. (Step S102). Then, the UE transmits RACH preamble using the RACH configuration (step S103).
  • the subsequent procedure is the same as the procedure after step S12 described with reference to FIG.
  • the eNB performs subsequent downlink transmission using the downlink beam corresponding to the resource (uplink beam) that received the RACH ⁇ preamble, and uses the uplink beam to perform subsequent reception. Can be executed.
  • the eNB when the eNB receives a RACH preamble with the upstream beam 1, it transmits a RACH response with the downstream beam 1. Thereby, UE can receive RACHRACresponse with good quality.
  • FIG. 7 shows a sequence of the non-collision type RA procedure in the present embodiment.
  • the UE has already selected a downlink beam (RACH configuration). This selection is performed at the time of RA with the first eNB, for example (procedure of FIG. 6).
  • RACH configuration a downlink beam used by the UE is transmitted from the eNB.
  • the UE transmits a RACH preamble. For example, assuming that downlink beam 1 is selected as the downlink beam at the time of step S201, the UE transmits RACH preamble using RACH configuration 1 in step S203.
  • the eNB may notify the UE not only of the preamble sequence but also of the transmission time / frequency resource. In this case, the UE transmits RACH preamble using this transmission time / frequency resource.
  • the transmission time / frequency resource is a resource associated with a reception beam that can receive an uplink signal from the UE with good quality (high reception level).
  • the reception beam is, for example, a beam selected by the eNB based on a signal from the UE in the connection state in step S201.
  • the correspondence information B between the downlink beam index and the RACH configuration is notified from the eNB to the UE as a broadcast signal, for example.
  • the eNB may notify the RACH configuration independently for each downlink beam so that the UE has correspondence information B between the RACH configuration and the downlink beam index.
  • the eNB notifies the RACH configuration X (RACH configuration identified by the index 1) using the downlink beam 1 and notifies the RACH configuration Y using the downlink beam 2.
  • the UE recognizes that the downlink beam index of the resource that has received the “RACH configuration X” is 1, associates the downlink beam index 1 with the RACH configuration X, and holds these.
  • it grasps that the downlink beam index of the resource that has received “RACH configuration Y” is 2, associates downlink beam index 2 with RACH configuration Y, and holds these.
  • the correspondence between the downlink beam index and the RACH configuration may be 1: 1 correspondence, N: 1 correspondence, or 1: N correspondence.
  • N is an integer of 2 or more.
  • the eNB can form a hierarchical beam.
  • a large number of narrow beams indicated by small circles (horizontal circles) are formed, and a wide beam (# 0 to # 6) is formed so as to bundle 6 to 7 narrow beams. can do.
  • the example of FIG. 8 is an example of a two-level hierarchy (grouping), but the number of hierarchies may be three or more.
  • FIG. 9A shows an example of 1: 1 correspondence between the downlink beam index and the RACH configuration. As shown in FIG. 9A, the downlink beam index and the RACH configuration correspond to 1: 1 as in the beam 1 and the RACH configuration 1.
  • FIG. 9B shows an example of N: 1 correspondence.
  • one RACH configuration is associated with a plurality of downlink beam indexes as in the case of beams 1 to 3 and RACH configuration 1.
  • the UE selects RACH configuration 1 when any of the beams 1 to 3 is selected based on the reception level (reception quality) of the beam selection signal.
  • a received wide beam corresponding to the width of N is associated with a RACH configuration (resource), and based on this correspondence, each received wide beam is associated with a corresponding RACH configuration.
  • RACH Use RACH to receive RACH preamble.
  • the eNB receives a RACH preamble transmitted in RACH configuration 1 by applying a wide beam obtained by bundling beams 1 to 3 as a reception beam. Then, the eNB transmits a RACH response to the UE using a downlink wide beam corresponding to the wide beam, for example.
  • the eNB can receive the RACH preamble with a wider beam, and the influence of beam selection mistakes can be reduced.
  • the RACH configuration preamble of the RACH configuration 1 is received by the reception beams 1 to 3. It is good to do.
  • FIG. 9C shows an example of 1: N correspondence.
  • a plurality of RACH configurations are associated with one downlink beam index, such as beam 1 and RACH configurations 1 to 3.
  • the beam to which the beam selection signal is transmitted may be the same beam as in the case of 1: 1 correspondence, or may be a wide beam as used in the case of N: 1 correspondence.
  • 1: N correspondence for example, when the UE selects beam 1 based on the beam selection signal, one RACH configuration from RACH configurations 1 to 3 is randomly selected and used, for example.
  • N support, for example, even when UE-A and UE-B select the same beam 1, UE-A and UE-B may select different RACH configurations (eg, different preamble sequences). is there. Therefore, in the case of 1: N correspondence, it is possible to reduce the collision probability between a plurality of UEs that have selected the same beam.
  • the width of the downlink beam formed by the eNB may not be uniform.
  • the beam toward the cell center can be a wide beam, and the beam at the cell edge can be a narrow beam.
  • either or both of a transmission power offset and a target reception level may be set for each RACH configuration. That is, the transmission power information is included in the RACH configuration information.
  • transmission power boost (offset for increasing transmission power) may be applied to a wide beam at the center of the cell. That is, in this case, the beam power index of a wide beam is associated with a RACH configuration and a transmission power offset indicating transmission power boost.
  • the eNB may transmit each beam for transmitting the beam selection signal using a beam having various widths such as a wide beam, a medium beam, and a narrow beam. For example, as shown in FIG. 8, the beam selection signal is transmitted with a narrow beam and the beam selection signal is transmitted with a wide beam. Even in this case, the correspondence information A between each beam index and resource and the correspondence information B between each beam index and the RACH configuration and the beam selection operation in the UE are performed in the same manner as described above. be able to.
  • information indicating a beam hierarchy may be added to the beam index, and the UE may select a beam of any hierarchy.
  • the beam index in the correspondence information A / B is “beam 1 (hierarchy A)”, “beam 1-1 (hierarchy B)”, “beam” “1-2 (hierarchy B)” includes hierarchy information.
  • the reception level in beam 1 is the best in layer A
  • the reception level in beam 1-2 is the best in layer B.
  • the UE selects the beam 1-2 having the highest reception level among the hierarchy A and the hierarchy B.
  • the UE sets the hierarchy based on one or any combination of its own capability (UE capability), location, moving speed (mobility), coverage state (cell center, cell edge, etc.). It is good also as selecting and selecting the best beam in the hierarchy.
  • the selection criterion (such as a hierarchy determination threshold) may be set from the eNB to the UE by a broadcast signal or higher level signaling, or may be set in advance.
  • the threshold value of the most recent average moving speed (mobility) is set as the above threshold value
  • the wide beam having high mobility tolerance If it is less than the threshold (low mobility), a narrow beam (large capacity) is selected.
  • a UE having a low reception level and low measurement accuracy may select a wide beam.
  • the beam hierarchy selection operation as described above makes it possible to change the beam hierarchy according to the state of the UE, thereby reducing the possibility of beam selection mistakes.
  • the RA preamble in the present embodiment can use the RA preamble similar to the conventional one.
  • the RA preamble does not include data other than the preamble. This is to minimize the loss at the time of collision.
  • the RA preamble used in the present embodiment may be a signal composed of a signal sequence and a payload area capable of reporting data bits in addition to a conventional signal composed of only a signal sequence. Good. Further, as the RA preamble, a signal composed only of a payload area capable of notifying data bits may be used.
  • FIG. 10 shows the configuration of the RA preamble when the RA preamble is composed of a signal sequence and a payload area.
  • the data in the payload area of a certain UE is multiplexed with the data of other UEs in any one of CDM, TDM, FDM, or any combination (including all).
  • the RA preamble has a payload area, explicit signaling using the RA preamble and UL data transmission can be performed.
  • UE transmits RACH preamble several times based on the set transmission resource pattern, without waiting for RACH response.
  • the eNB performs RACH preamble reception each time by applying different receive beamforming.
  • the eNB and the UE may have the function in the second embodiment in addition to the function in the first embodiment, or the second function without the function in the first embodiment. It is good also as having the function in an embodiment.
  • the eNB and the UE will be described assuming that the function in the second embodiment is added to the function in the first embodiment and which function can be switched. It is assumed that the eNB and UE in the following description have the functions described in the first embodiment.
  • a RACH transmission pattern that is a pattern when the UE performs RACH preamble transmission a plurality of times is defined, and the UE holds the RACH transmission pattern.
  • the RACH transmission pattern may be set in advance in the UE, or may be notified from the eNB to the UE by broadcast information, higher layer signaling, or the like. Further, the eNB may notify (set) a plurality of RACH transmission patterns to the UE as the RACH transmission pattern, and the UE may select and use one RACH transmission pattern from among the plurality of RACH transmission patterns.
  • the plurality of RACH transmission patterns include, for example, a plurality of RACH transmission patterns such as an N-time transmission pattern and an (N + X) -time RACH transmission pattern.
  • N is an integer of 2 or more
  • X is an integer of 1 or more.
  • the RACH transmission pattern includes, for example, a RACH configuration used for each RACH preamble transmission.
  • the RACH transmission pattern is (RACH configuration 1, RACH configuration 2, RACH configuration 3, RACH configuration 4)
  • the UE performs RACH preamble with a predetermined time interval (eg, m subframe interval (m is 1 or more). ))
  • RACH configuration 1, RACH configuration 2, RACH configuration 3, and RACH configuration 4 are transmitted in this order.
  • the preamble sequences at each time may be the same sequence or different sequences.
  • RACH configuration is represented by time resources
  • RACH transmission pattern is (RACH configuration 1, RACH configuration 2, RACH configuration 3, RACH configuration 4)
  • the UE supports each RACH configuration.
  • RACH preamble is transmitted at the time to perform (eg, subframe).
  • FIG. 11 is a diagram illustrating an example of RACH preamble transmission multiple times when the RACH configuration is represented by time resources as described above.
  • the RACH transmission pattern is (RACH configuration 1, RACH configuration 2, RACH configuration 3, RACH configuration 4)
  • the RACH configuration 1 corresponding to (a) is used.
  • RACH preamble is transmitted, and RACH preamble is transmitted with RACH configuration 2 corresponding to (b).
  • RACH preamble transmitted in each RACH configuration is received by the eNB in the reception beam corresponding to the RACH configuration.
  • the transmission time interval may be specified by the RACH transmission pattern.
  • the RACH transmission pattern is (RACH configuration 1: a, RACH configuration 2: b, RACH configuration 3: c, RACH configuration 4)
  • the UE Transmits RACH preamble with RACH configuration 1 first, and RACH preamble with RACH configuration 2 after time a.
  • b and c are values indicating time lengths and the RACH transmission pattern.
  • step S201 the UE transmits RACH preamble a plurality of times in accordance with the set RACH transmission pattern.
  • step S202 the eNB identifies the uplink reception beam (RACH configuration) that has successfully received the RACH preamble.
  • RACH configuration the uplink reception beam that has successfully received the RACH preamble.
  • step S203 the eNB transmits, for example, a RACH response including the index of the RACH configuration identified in step S202 (that is, the index of the uplink reception beam) to the UE.
  • RACH response may be transmitted to the UE using a downlink transmission beam (reverse) corresponding to the uplink reception beam specified in step S202.
  • the eNB can use the uplink reception beam specified in step S202 for uplink data reception of the UE. Further, the eNB can use the downlink beam used in step S203 for data transmission to the UE.
  • the UE applies transmission multiple times regardless of its own coverage state (downlink radio quality), but depending on the downlink radio quality (reception level, reception quality, etc.), as shown below, the RACH The transmission pattern may be changed.
  • the N-time transmission RACH transmission pattern is selected.
  • the (N + X) -time transmission RACH transmission pattern is selected. May be.
  • X is the number of times depending on the radio quality, and X when the radio quality is low is larger than X when the radio quality is high.
  • the eNB may notify the UE of the availability of RACH preamble multiple times using a notification signal.
  • the UE and the eNB perform the operation described in the first embodiment.
  • RACH preamble transmission “permitted” is notified by the broadcast signal
  • the UE and the eNB perform the operation described in the second embodiment.
  • the RACH transmission pattern is notified from the eNB to the UE, it may mean that the RACH preamble is transmitted multiple times. With such a configuration, it is possible to switch between the operation of the first embodiment and the operation of the second embodiment.
  • the UE determines based on the beam with the highest reception level as a result of measurement of the beam selection signal, and is common among RACH preamble transmissions (described later). Except between Power ramping).
  • the above measurement is, for example, measurement in each downlink beam (downlink resource) corresponding to the RACH configuration in the RACH transmission pattern to be used. Determining the transmission power based on the beam corresponds to calculating the transmission power based on the path loss or the like in the beam.
  • the eNB selects an uplink reception beam for a RACH preamble having the highest reception level among a plurality of RACH preamble receptions.
  • ENB can reflect the selected uplink reception beam in the reception time window (transmission time window as seen from the eNB).
  • reception time window transmission time window as seen from the eNB.
  • correspondence information between the reception time window and the beam index that is, uplink resource
  • ENB can receive the transmission data from the user by the uplink reception beam.
  • the eNB may transmit a RACH response to the UE using control information including information corresponding to the selected uplink reception beam or a CRC mask bit.
  • the UE can perform uplink data transmission using the resource corresponding to the uplink reception beam by detecting information corresponding to the uplink reception beam from the RACH response.
  • Transmission may be performed using the set RACH transmission pattern once, and transmission may be performed using the RACH transmission pattern a plurality of times when the reception level is a predetermined threshold value or less. Even when the RACH transmission pattern is transmitted a plurality of times, the transmission power is constant.
  • the transmission of the RACH transmission pattern is stopped after the RACH response can be received.
  • ⁇ Change in UE side beam selection> for example, when the maximum transmission power of the UE is reached by transmitting the RACH transmission pattern a plurality of times while power ramping, or when a predetermined number of transmissions is exceeded, or downlink
  • the UE may change the RACH configuration (that is, the beam index selected on the UE side) when the measurement result changes.
  • the predetermined number of transmissions may be a RACH preamble transmission number threshold or a RACH transmission pattern transmission number threshold.
  • the case where the downlink measurement result has changed is, for example, when the maximum reception level in each downlink beam (downlink resource) corresponding to the RACH configuration in the RACH transmission pattern to be used is equal to or less than a predetermined threshold. is there.
  • FIG. 13 shows an example of changing the RACH configuration for transmitting RACH preamble.
  • the UE uses the same RACH transmission pattern (RACH configuration set) until the transmission power of the UE reaches a predetermined threshold (maximum transmission power determined by the UE capability or network setting value).
  • RACHCHpreamble is transmitted using a RACH transmission pattern (a RACH configuration set) different from the previous transmission until the maximum number of transmissions is reached.
  • the same RACH transmission pattern (eg, a set of RACH configurations 1 to 4) is used until the transmission of the third RACH transmission pattern that reaches the maximum transmission power by power ramping.
  • a RACH transmission pattern different from that in the third time (eg, a set of RACH configurations 5 to 8) is used.
  • different RACH transmission patterns are transmitted twice in the fourth transmission for coverage extension.
  • the power ramping may be reset. As a result, RACH ⁇ preamble transmission with excessive transmission power can be avoided.
  • the UE performs measurement (measurement) of, for example, a beam selection signal (synchronization signal, reference signal, etc.), and re-establishes the RACH configuration (beam index) to be transmitted next based on the measurement result. You may choose. Further, the UE sequentially selects a RACH configuration (beam index) having a high reception level (reception quality) obtained from the above measurement result when the RACH configuration is changed (for example, the fourth time shown in FIG. 13). Thus, a set of RACH configurations may be selected. By such an operation, a more reliable RACH configuration change (beam change) becomes possible.
  • the UE may switch the transmission precoding every time RACH preamble transmission or every time the transmission power ramps up.
  • the precoding index may be switched cyclically, or the UE may apply arbitrary precoding. A transmission diversity gain is obtained by such an operation.
  • FIG. 14 shows an example when the UE switches transmission precoding.
  • the UE uses transmission precoding in which the # 1 transmission beam is first formed, and then performs transmission using the # 2 transmission beam when a switching trigger (RACH preamble transmission, Ramp up) occurs. And so on.
  • a switching trigger RACH preamble transmission, Ramp up
  • the eNB can select an optimal uplink reception beam by receiving RACH preamble. Also, the eNB can apply an optimal reception beam when receiving transmission data from the UE corresponding to the RACH response. Furthermore, overhead and delay can be reduced by multiple transmissions due to the beam diversity effect.
  • the UE selects a downlink beam index, selects a RACH configuration corresponding to the selected downlink beam index, and transmits a RACH preamble according to the RACH configuration, so that the downlink Beam selection can also be performed simultaneously.
  • ⁇ About RAR> When the eNB detects RACH preambles from a plurality of UEs at the same time, the eNB can aggregate the RARs to each UE and transmit them at one time. On the other hand, in this Embodiment, eNB can select the downlink beam suitable for UE for every UE, and can transmit RAR with the said downlink beam.
  • each downlink beam is transmitted with, for example, different time / frequency resources, it is not preferable to mix UEs with different downlink beams when the RARs of a plurality of UEs are aggregated and transmitted.
  • the eNB aggregates RARs with the same downlink beam selected from a plurality of RARs that can be aggregated, and transmits the aggregated RARs in the same MAC PDU.
  • a MAC PDU having a single RAR is transmitted.
  • An example of a MAC PDU including a plurality of RARs is shown in FIG. In the example of FIG. 15, RAR1 to n are transmitted using the same downlink beam. By such processing, RAR transmission can be efficiently performed using an optimal downstream beam.
  • RAR is mapped to CSS (Common Search Space) in PDCCH and transmitted.
  • CSS Common Search Space
  • the CSS that transmits the RAR may be divided into a plurality of subsets, and different beam indexes may be associated with each subset.
  • FIG. 16A An example is shown in FIG. 16A.
  • the CSS is divided into four subsets, and beam 1, beam 2, beam 3, and beam 4 are associated with each other.
  • This association information is notified to the UE by, for example, a broadcast signal, higher level signaling, or the like.
  • ENB when transmitting the RAR of a certain UE using beam 1, maps the RAR of the UE to the CSS area corresponding to beam 1, and transmits the mapped RAR.
  • the UE can grasp that the RAR is transmitted by the beam 1 by detecting its own RAR in the area. Thereby, for example, in the second embodiment, the UE can recognize which RACH configuration (beam index) transmitted by itself is optimal. Further, reception beamforming can be applied to the RAR on the UE side.
  • the RAR reception window may be divided into a plurality of subsets, and the subsets and beam indexes may be associated with each other as in the case of CSS. Good. An example of this case is shown in FIG. 16B.
  • the RNTI used for the CRC mask may be made to correspond to the beam index (or group). That is, for example, the value of a predetermined bit of RNTI may be used as the beam index.
  • the eNB when the eNB succeeds in RACH preamble reception with a plurality of RACH configurations for a single UE, the eNB includes information indicating that in the RAR addressed to the UE (eg, successful reception) A plurality of beam indexes corresponding to the RACH configuration or the like may be transmitted. Further, the beam index information may be included in the RAR in the order of the RACH preamble reception level. Thereby, UE can grasp
  • the eNB has information on the RACH configuration (such as a beam index) that has been successfully received in the RAR or in a shared field of a plurality of RARs of the MAC PDU that transmits the RAR (such as the MAC Header shown in FIG. 15). May be transmitted.
  • This configuration is more suitable when the upstream beam index and the downstream beam index are independent, for example, when FDD is used.
  • the eNB adjusts the transmission timing of the uplink signal of each UE, and performs control so that the shift in reception timing at the eNB falls within a predetermined time. Specifically, the eNB measures the difference between the desired uplink signal reception timing and the actual uplink signal reception timing for each UE, and instructs the UE to shift the uplink signal timing forward by the difference. .
  • This instruction is performed, for example, by a TA (Timing Advance) command (TA value) included in the RAR during the RA procedure.
  • TA Timing Advance
  • the eNB notifies the UE of the reference TA value for each downlink beam index (step S301), and notifies the offset value with respect to the reference TA value with a TA command (Ste S302).
  • the area where each beam reaches can be considered as a small cell, and a small range of values is sufficient for the offset value to cover the area.
  • the notification of the reference TA value may be performed by a notification signal or may be performed by higher level signaling. Further, the reference TA value may be included in the correspondence information A described above in association with each beam index. In addition to the correspondence information A, the reference TA value and the beam index may be notified as a list associated with each other.
  • FIG. 18 An example is shown in FIG. In the example of FIG. 18, TA1 is notified as the reference TA value to the beam 1, and TA2 is notified as the reference TA value to the beam 2. Then, within each beam area, each UE is notified of the offset value relative to the reference TA value as a TA command.
  • the TA command by RAR may be eliminated. Further, the range of the TA command may be reduced.
  • the TA notified by the MAC PDU that transmits the RAR is the reference TA value between the RARs and the RAR. It is good also as dividing
  • the reference TA value is transmitted in the MAC header, and the offset TA value of each UE is included in the corresponding RAR. Accordingly, when the length of the reference TA value is 7 bits and the length of the offset TA value is 4 bits, overhead reduction of (N ⁇ 1) ⁇ 7 bits can be achieved by N RAR multiplexing.
  • the eNB may notify the relative value with respect to the reference time (UTC time) of the synchronization timing, and the UE that has acquired the reference time by GNSS or the like may autonomously apply the TA.
  • the TA command by RAR may be eliminated or the range of the TA command may be reduced.
  • the signaling overhead can be reduced by the operation of the modified example as described above. It is also possible to eliminate the need for a TA command.
  • an effective TA is possible by utilizing the correlation between beam and TA value. Furthermore, an effective TA can be performed by using the similarity of TA values between RARs transmitted by the same MAC PDU by associating the beam with the RAR reception resource / search space.
  • the search space in which the UE monitors RAR, Contention resolution (message 4), etc. may be a UE common search space, a UE group search space, or a UE-specific search space.
  • a UE that has selected a certain beam index can prevent unnecessary monitoring omission and erroneous recognition of control information between beams by monitoring only the UE group search space corresponding to the beam.
  • RACH configuration a certain beam index
  • Each area shown in FIG. 16A described above is an example of a UE group search space.
  • the UE common search space is effective when it is difficult to limit the search space when beam selection is not performed or when the beam is retransmitted after changing the beam.
  • FIG. 19 shows a functional configuration diagram of the UE.
  • the UE includes a UL transmission unit 101, a DL reception unit 102, an RRC management unit 103, an RA control unit 104, a measurement unit 105, and a power control unit 106.
  • FIG. 19 shows only functional units particularly relevant to the present invention in the UE, and the UE also has a function (not shown) for performing an operation based on at least LTE.
  • the UL transmission unit 101 includes a function of generating various signals of the physical layer from information on higher layers to be transmitted from the UE and transmitting the signals to the eNB.
  • the DL receiving unit 102 includes a function of receiving various downlink signals from the eNB and acquiring higher layer information from the received physical layer signals. Further, the UL transmission unit 101 and the DL reception unit 102 also include a function for performing processing related to TA described in the modification.
  • the RRC management unit 103 acquires a broadcast signal, an upper layer signal, and the like from the eNB via the DL reception unit 102, acquires setting information such as correspondence information and pattern information from these signals, and stores the setting information.
  • the RA control unit 104 generates signals in the random access procedure described in the first and second embodiments and modifications, and transmits and receives signals in random access via the UL transmission unit 101 / DL reception unit 102. Control. This control is executed based on setting information such as correspondence information and pattern information stored in the RRC management unit 103.
  • the measurement unit 105 includes a function of measuring a reception level of a signal received from the eNB and performing beam selection (eg, RACH configuration selection) based on the measurement result. That is, the measurement unit 105 includes a selection unit.
  • the power control unit 106 controls the transmission power of the signal transmitted from the UL transmission unit 101.
  • the configuration of the UE shown in FIG. 19 may be realized entirely by a hardware circuit (eg, one or a plurality of IC chips), or part of the configuration may be realized by a hardware circuit, and the other part may be a CPU and a program. And may be realized.
  • a hardware circuit eg, one or a plurality of IC chips
  • part of the configuration may be realized by a hardware circuit, and the other part may be a CPU and a program. And may be realized.
  • FIG. 20 is a diagram illustrating an example of a hardware (HW) configuration of the UE.
  • FIG. 20 shows a configuration closer to the mounting example than FIG.
  • the UE controls an apparatus that performs processing such as an RE (Radio Equipment) module 151 that performs processing related to a radio signal, a BB (Base Band) processing module 152 that performs baseband signal processing, and a higher layer. It has a module 153 and a USIM slot 154 which is an interface for accessing a USIM card.
  • RE Radio Equipment
  • BB Base Band
  • the RE module 151 should transmit from the antenna by performing D / A (Digital-to-Analog) conversion, modulation, frequency conversion, power amplification, etc. on the digital baseband signal received from the BB processing module 152 Generate a radio signal.
  • a digital baseband signal is generated by performing frequency conversion, A / D (Analog to Digital) conversion, demodulation, and the like on the radio signal received from the antenna, and passes it to the BB processing module 152.
  • the RE module 151 includes functions such as a physical layer in the UL transmission unit 101 and the DL reception unit 102 in FIG. 19, for example.
  • the BB processing module 152 performs processing for mutually converting an IP packet and a digital baseband signal.
  • a DSP (Digital Signal Processor) 162 is a processor that performs signal processing in the BB processing module 152.
  • the memory 172 is used as a work area for the DSP 162.
  • the BB processing module 152 includes, for example, the UL transmission unit 101 in FIG. 19, functions such as layer 2 in the DL reception unit 102, the RRC management unit 103, the RA control unit 104, the measurement unit 105, and the power control unit 106. Note that all or some of the functions of the RRC management unit 103, the RA control unit 104, the measurement unit 105, and the power control unit 106 may be included in the device control module 153.
  • the device control module 153 performs IP layer protocol processing, various application processing, and the like.
  • the processor 163 is a processor that performs processing performed by the device control module 153.
  • the memory 173 is used as a work area for the processor 163.
  • the processor 163 reads and writes data with the USIM through the USIM slot 154.
  • FIG. 21 shows a functional configuration diagram of the eNB.
  • the eNB includes a DL transmission unit 201, a UL reception unit 202, an RRC management unit 203, an RA control unit 204, and a BF management unit 205.
  • FIG. 21 shows only functional units that are particularly related to the embodiment of the present invention in the eNB, and the eNB also has a function (not shown) for performing an operation that conforms to at least the LTE scheme.
  • the DL transmission unit 201 includes a function of generating and transmitting various physical layer signals from upper layer information to be transmitted from the eNB.
  • the UL reception unit 202 includes a function of receiving various uplink signals from the UE and acquiring higher layer information from the received physical layer signals.
  • the DL transmission unit 201 and the UL reception unit 202 include multi-element antennas and have a function of performing beam forming in various layers.
  • the DL transmission unit 201 and the UL reception unit 202 include a function of performing processing related to TA described in the modification.
  • the RRC management unit 203 includes a function of creating a notification signal, upper layer signal, and the like including correspondence information, pattern information, and the like and transmitting them to the UE via the DL transmission unit 201.
  • the RA control unit 204 performs signal transmission / reception via the DL transmission unit 201 / UL reception unit 202 in the random access procedure described in the first and second embodiments and modifications.
  • the BF management unit 205 manages a beam index, a hierarchy, and the like applied by the eNB.
  • the configuration of the eNB shown in FIG. 21 may be realized entirely by a hardware circuit (eg, one or a plurality of IC chips), or a part may be configured by a hardware circuit, and the other part may be a CPU and a program. And may be realized.
  • a hardware circuit eg, one or a plurality of IC chips
  • a part may be configured by a hardware circuit, and the other part may be a CPU and a program. And may be realized.
  • FIG. 22 is a diagram illustrating an example of a hardware (HW) configuration of the eNB.
  • FIG. 22 shows a configuration closer to the mounting example than FIG.
  • the eNB is connected to the network by an RE module 251 that performs processing related to a radio signal, a BB processing module 252 that performs baseband signal processing, a device control module 253 that performs processing such as an upper layer, and the like.
  • a communication IF 254 which is an interface for this purpose.
  • the RE module 251 generates a radio signal to be transmitted from the antenna by performing D / A conversion, modulation, frequency conversion, power amplification, and the like on the digital baseband signal received from the BB processing module 252.
  • a digital baseband signal is generated by performing frequency conversion, A / D conversion, demodulation, and the like on the radio signal received from the antenna, and is passed to the BB processing module 252.
  • the RE module 251 includes functions such as a physical layer in the DL transmission unit 201 and the UL reception unit 202 in FIG.
  • the eNB antenna is a multi-element antenna capable of forming transmission beams and reception beams of various layers.
  • the BB processing module 252 performs processing for mutually converting an IP packet and a digital baseband signal.
  • the DSP 262 is a processor that performs signal processing in the BB processing module 252.
  • the memory 272 is used as a work area for the DSP 252.
  • the BB processing module 252 includes, for example, functions such as layer 2 in the DL transmission unit 201 and the UL reception unit 202 in FIG. 21, an RRC management unit 203, an RA control unit 204, and a BF management unit 205. Note that all or some of the functions of the RRC management unit 203, the RA control unit 204, and the BF management unit 205 may be included in the device control module 253.
  • the device control module 253 performs IP layer protocol processing, OAM processing, and the like.
  • the processor 263 is a processor that performs processing performed by the device control module 253.
  • the memory 273 is used as a work area for the processor 263.
  • the auxiliary storage device 283 is an HDD, for example, and stores various setting information for the base station eNB itself to operate.
  • the configuration (functional category) of the apparatus shown in FIGS. 19 to 22 is merely an example of a configuration that realizes the processing described in the present embodiment (including the first and second embodiments and modifications). Absent. If the processing described in this embodiment (including the first and second embodiments and modifications) can be realized, its mounting method (specific functional unit arrangement, name, etc.) It is not limited to the mounting method.
  • the user apparatus that communicates with the base station in a wireless communication system including the base station and the user apparatus, the beam identifier formed by the base station, A storage unit that stores correspondence information that associates configuration information used for transmission of a random access signal, and a specific beam is selected based on reception quality of signals transmitted from the base station using a plurality of different beams.
  • a selection unit that selects configuration information corresponding to the specific beam based on the correspondence information, and a transmission unit that transmits a random access signal to the base station using the configuration information selected by the selection unit Is provided.
  • the above configuration enables the base station to appropriately apply the beam in random access performed between the user apparatus and the base station.
  • a plurality of beam identifiers may be associated with one piece of configuration information.
  • the base station can receive a random access signal with a wider beam.
  • a plurality of pieces of configuration information may be associated with one beam identifier.
  • the configuration information may include transmission power information, and the transmission unit may transmit the random access signal using transmission power based on the transmission power information.
  • the beam formed by the base station has a hierarchical structure, and the selection unit selects a specific beam in a specific hierarchy based on a predetermined criterion, and specifies the specific beam based on the correspondence information. It is also possible to select configuration information corresponding to the beam. With this configuration, for example, a beam having an appropriate hierarchy can be selected according to the state of the user apparatus, and the possibility of beam selection mistakes can be reduced.
  • the user apparatus that communicates with the base station in a wireless communication system including a base station and a user apparatus, the configuration information used for transmitting a random access signal, the base station Using a storage unit that stores a transmission pattern having a plurality of configuration information associated with the beam formed by each beam and each configuration information in the transmission pattern, a random access signal is transmitted a plurality of times without waiting for a random access response.
  • a user apparatus including a transmitting unit.
  • the above configuration enables the base station to appropriately apply the beam in random access performed between the user apparatus and the base station.
  • the user apparatus further includes a receiving unit that receives from the base station information indicating whether or not to perform the operation of transmitting the random access signal a plurality of times, and the receiving unit includes information indicating that the operation is not performed.
  • the user apparatus selects a specific beam based on reception quality of signals transmitted from the base station using a plurality of different beams, and uses configuration information corresponding to the specific beam.
  • a random access signal may be transmitted. With this configuration, even when the operation is not performed a plurality of times, the base station can receive the random access signal by appropriately applying the beam.
  • the transmission unit changes the set of configuration information constituting the transmission pattern when a predetermined condition is satisfied while performing the operation of transmitting the random access signal a plurality of times, and the configuration after the change
  • the random access signal may be transmitted a plurality of times using a set of information. With this configuration, the success probability of random access can be increased.
  • the operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components.
  • the base station eNB and the user apparatus UE have been described using functional block diagrams, but such an apparatus may be realized by hardware, software, or a combination thereof.
  • software that is operated by a processor included in the user equipment UE and the base station eNB includes random access memory (RAM), flash memory, read only memory (ROM), EPROM, EEPROM, register, hard disk ( (HDD), a removable disk, a CD-ROM, a database, a server, or any other suitable storage medium.
  • information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC signaling, MAC signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof.
  • RRC message may be referred to as RRC signaling.
  • the RRC message may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
  • Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 5G
  • FRA Full Radio Access
  • W-CDMA Wideband
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB User Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 UWB (Ultra-WideBand
  • the present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.
  • the determination or determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true value (Boolean: true or false), or may be performed by comparing numerical values (for example, (Comparison with a predetermined value).
  • the channel and / or symbol may be a signal.
  • the signal may be a message.
  • UE is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal by those skilled in the art , Remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.
  • notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.
  • determining may encompass a wide variety of actions.
  • “Judgment”, “decision” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another (Searching in the data structure), and confirming (ascertaining) what has been confirmed may be considered as “determining” or “determining”.
  • “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as “determined” or "determined”.
  • determination and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.
  • the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
  • the input / output information or the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.
  • the notification of the predetermined information is not limited to explicitly performed, and may be performed implicitly (for example, notification of the predetermined information is not performed). .

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CN201780009353.XA CN108702635A (zh) 2016-02-04 2017-02-03 用户装置以及随机接入方法
AU2017215885A AU2017215885B2 (en) 2016-02-04 2017-02-03 User equipment and random access method
EP17747606.6A EP3413607B1 (en) 2016-02-04 2017-02-03 User equipment, and random access method
ES17747606T ES2949298T3 (es) 2016-02-04 2017-02-03 Equipo de usuario y método de acceso aleatorio
US16/074,160 US11632800B2 (en) 2016-02-04 2017-02-03 User equipment and random access method
JP2017565672A JP7102148B2 (ja) 2016-02-04 2017-02-03 端末、プリアンブル送信方法、基地局、及び通信システム
CN202310416489.XA CN116405952A (zh) 2016-02-04 2017-02-03 终端、前导码发送方法、基站以及通信系统
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